you're forgetting that you learn about 100 other people's careers and industries, Wisdom and Insight of profs that tell you what isn't in the book, and the book

you're forgetting that you learn about 100 other people's careers and industries, Wisdom and Insight of profs that tell you what isn't in the book, and the book knowledge, which I feel certain anyone focused full time on a startup doesn't have time for. People have been ripped off for hundreds of thousands of dollars before for simply not understanding basic accounting.